Mirror device for looms for ascertaining from the position of the weaver breaking of warp threads or the like in the loom



1939. E. HOCHHEIMER 2,171,493

MIRROR DEVICE FOR LOOMS FOR ASCERIAINING FROM THE POSITION OF THE WEAVER BREAKING 0F WARP THREADS OR THE LIKE IN THE LOOK Filed Sept. 1, 1937 Patented Aug. 29, 1939 PATENT OFFICE MIRROR DEVICE FOR LOOMS FOR TAINING mom THE rosrrron WEAVER BREAKIN ASCER- OF THE G F WARP THREADS OR. THE LIKE. IN THE LOOM Ernst Hochheimer, Aachen, Germany Application September 1, 1937, Serial No. 162,024

In Germany September 2, 1936 2 Claims.

where breaking of warp threads has occurred,

so that he can tie up the broken thread.

In the known observation mirrors and especially in observation mirrors mounted approximately at the height of the heald shafts on the one sideof the loom, and arranged on the loom frame so that the mirror can be adjusted to any desired position, this mirror reflects, owing to the vibrations causedp y the shaking oi the loom, very often a pictlire which is so little clear and s0 disquieted that it is impossible to see a single broken thread.

This inconvenience is avoided tion.

The invention consists essentially therein that the mirror is fixed elastically or yieldably, for instance by means of a spring, a rubber band, a rubber cord or the like, on the frame wall or on the harness strap of the loom. Prejudicial oscillations of the mirror, which might happen during the service, which influence the clearness 25 and distinctness of the picture of the interior of the shed in the mirror, are avoided. This is attained in a particularly effective manner, if the mirror itself is suspended like a pendulum on its connection elements so that these elements intercept the resonance-oscillations and vibrations of' the machine frame and do not transmit the same upon the mirror.

An embodiment of the invention is illustrated, by way of example, in the accompanying drawing, in which- Fig. 1 shows in perspective view a loom with a mirror suspended on the same.

Fig. 2 shows two mirrors suspended on a loom, and

40 Figs. 3 and 4 show each one on larger scale the fixation of the mirror on the frame.

As can be seen from the drawing amirror I is arranged laterally of the heald shafts I in front of one end of the shed 3 so that it can be moved in all directions and secured in any adjusted position. The mirror 4 is suspended on the harness strap 2 of the loom. Infront of the otherend ofshed 3 a plate 6 is arranged on the frame wall 5 of the loom opposite the mirror 4, so that it forms the background for the picture'which the weaver sees in the mirror 4. This plate 6 is colored light on one side and dark on the other side and is adapted to be turned round so that, according to the coloring by the invenof the warp threads the light or dark side of the plate 6 faces the mirror 4.

The mirror 4 is mounted in a U-shaped strap 1 so that it can be turned around a horizontal axis and secured by means of a set screw 8 in the positionwhich it actually assumes relative to the strap 1. On the web of strap 1 a pendulum rod 9 is fixed perpendicularly to the axis of rotation of the mirror 4, the upper portion of this rod being adapted to turn and to be shifted in vertical direction in a hub 10 and to be secured in the adjusted position in said hub ID by means of a set screw H.- The hub III has two arms l2, to the ends of which pull springs springs being 'adjustably attached to the ends of the arms of a horizontal rod l5 fixed on the harness strap 2 of the loom bymeansof a U- shaped-shoe i6 pushed over the same from below. The rod resting on the harness strap 2 extends transversely to the arms of shoe l6, and

a pressure screw II for clamping the rod IS on the harness strap is screwed into the web of the shoe and directed perpendicularly to this web and to the harness strap. The upper portion of the pendulum rod 9, which carries the mirror 4, extends with large clearance through the .point of intersection of rod l5 and the arms l2 and ii of a hub l8 forming this point of intersection. On the upper end of the pendulum rod 9 a weight I9 is mounted. Another hub engages with large clearance over the pendulum rod 9 and is fixed by means of laterally projecting screw bolts 2! on one of the arms of an angle piece 22 the other arm of which is carried by a rod 23 parallel to the pendulum rod 9 and screwed at its upper end on an extension of the carrying rod iii. The mirror 4 is thus suspend- -ed very efiectively elastic and penduling on the harness strap 2, so that resonance oscillations and vibrations of the loom frame are practically not transmitted upon the mirror 4. If very strong vibrations of the loom frame occur, they can at the utmost impart slow oscillations tothe mirror owing to its pendulum-like suspension, such slow oscillations impairing the picture of the shed appearing in the mirror to only a very little degree as regards clearness and distinction. The mirror 4 can be adjusted in any desired direction after the screws 8, II have been loosened and secured again in the adjusted position by tightening said screws. The observation mirror 4 has to be adjusted so that the weaver can see from his place in front of the loom in the mirror through the shed 3 and under the warp [3 are attached, the upper ends of said 1 warp thread which hangs into the shed 3 or has been entangled in the shed with other warp threads, the more so as the broken warp thread clearly stands out from the back ground-plate 6.

The observation mirror is no impediment for the weaver so that it is not exposed to damages, and the less so as the oscillations of the mirror,

caused by very strong vibrations of the loom or by knocking against the mirror, are intercepted by the pendulum 9 of the mirror striking against the hubs I8 and 20.

The mirror 4 might be suspended on the harness strap instead of by means of two pull springs by means of three. or even a greater number of pull springs.

1. In a mirror arrangement for detecting from the operator's stand any breakage of warp threads on looms, a mirror, a pendulum rod carrying said mirror at its lower end, means for oscillatably and rotatably suspending said pendulum rod on the loom frame said means comprising a clamp adapted to be fixed on the loom frame, a horizontal rod adapted to be turned about its axis in said clamp and fixed in its adjusted position, v a hub on said horizontal rod slidably guiding the upper end of said pendulum rod, an extension from said hub diametrically opposite said horizontal rod, a vertical rod fixed at its upper end in said extension and extending in downward direction parallel to said pendulum rod, an angle piece fixed on the lower end of said vertical rod, a sleeve slidably guiding said pendulum rod intermediate its length, and means for adjusting the position of said sleeve relatively to said bracket.

2. In a mirror arrangement for detecting from the operator's stand any breakage of warp threads on looms, a mirror, a pendulum rod carrying said mirror at its lower end, means for oscillatably and rotatably suspending said pendulum rod on the loom frame said means comprisinga' clamp adapted to be fixed on the loom frame, a horizontal rod adapted to be turned about its axis in 1 said clamp and fixed in its adjusted position, a hub on said horizontal rod slidably guiding the upper end of said pendulum rod, an; extension from said hub diametrically opposite said horizontal rod, a vertical rod fixed at its upper end in L said extension and extending in downward direction parallel to said pendulum rod, an angle piece fixed on the lower end of said vertical rod, a sleeve slidably guiding said pendulum rod intermediate its length, means for adjusting the posi- 2 tion of said sleeve relatively to said bracket, a ring slidable on said pendulum rod intermediate said hub and said sleeve, means for fixing said ring in any adjusted position on said pendulum rod, two diametrically opposite arms projecting horizontally from said hub at right angles to said horizontal bar, two diametrically opposite arms projecting horizontally from said ringvemdex;

tending parallel to said first mentioned arms, and

springs one connecting the outer end of each of 30 the hub arms with the outer end of the corresponding ring arm and'establishing resilient connection between said pendulum rod and the loomframe through the intermediary of said horizontal rod and said clamp.

ERNST HOCHHEIMER. 

